Sausage linking machine



March 14, 1933. P, A. JAcoBsoN SAUSAGE LINKING' MACHINE 1930 3Sheets-Sheet l Filed June l5 March 14, 1933.v P. A. JAcoBsoN SAUSAGELINKING MACHINE 3 Sheets-Sheet `2 Filed June 13, 1930 am. ma mN PMR. ou

March 14, 1933. P A- JACOBSON 1,901,452

SAUSAGE LINKING MACHINE Filed June 13, 1930 3 Sheets-Sheet 3 PatentedMar. 14, 193? UNITED STATE-s :PATENT orifice PARKER A. .T AooBsoN, Fwnvolvh,` MIvNNEsoaA c SAUSAGE LINKINGi MACHINE.

Application led .Tune 13,

vThis invention relates to a sausage linking machine and has for itsobject the provision of such a machine thatis relatively simple,compact, of light-weight, highly eflicient and positive in its action,and having an open or top feed through which a A*casing may be placed inthe machine vby a lateral movement `and the formed linksremovedtherefrom by a' like movement, thus permitting fast many In theaccompanying drawings, whichl ilf lustrate the invention, likecharacters indilcate like parts throughout the several views.

Referring to the drawings;

Fig. 1 is a front side elevation of the im proved sausage linkingmachine; 1

Fig. 2 is a plan view of the same; Fig. 3 is a view partly in elevationand partly in section taken on the line 3a.? of Fig. 2;

Fig. 4 is a left-hand elevation of the machine, some parts being brokenaway;

Figs. 5, 6, 7 and 8 are transverse vertical sections taken on the lines5, 6;-6,77 and 8-8 of Fig. 1, respectively;

Fig. 9 is a view corresponding to Fig. 8, but showing the machine open;

Fig. 10 is a fragmentary perspectivefview of one of the combined spacersand squeezers;

Fig. 11 is an-elevation vof a lfilled sausage casing ready to be placedin the machine to be formed into links; and i Fig. 12 is a view of thecasing removed from the machine and formed in links.V

The frame of the machine includes a pair of laterally spaced end members13 and a 1920. serial No. 46u35.

pair of longitudinal side bars 14,`which 'eX- v tend through bossedholes insaid end members and are rigidly secured thereto by set- Ascrewsy15.. lSaid end members 13 have aperture'd feet which may besecured to atable or other support by anchorstuds, not shown.

.Bearing-heads 16gand'1v7 are mounted on` thev left and right-hand endsof the sidebars 14, respectively, youtward ofthe end members bars 14extend and are rigidlysecuredthereto by set-screws 1S..` The frame 13-14and the bearing heads 16 and 17 may be readily knocked-down by looseningthe set-screws lhesebearingy heads y16 and 17 have bossed holes into,which the ends` of the sidel 15'and'18 and withdrawing the side bars 14`from the bossedfholes in the endmembers 13 `and heads 16 and 17 throughwhich they eX- tend. i

y Av pair of radially spaced rock-shafts 19,

in the form of flat bars set vertically edgewise parallel to the sidebars 14, have on-ftheir ends trunnions iournaled in seats in the heads16;and'17. n 1 Combined spacers and squeezers 2O are provided for.displacing `the filler ina sausage casing X, atv longitudinally'spacedpointsto form -links Y r and alternate links Y are twisted in reversevrdirections by pairs of cooperating belts 21 and the intervening linksare held stationary by'supports 22. For

brevity the combined spacers and squeezers 20 will hereinafterbereferred to as spacers.

The kmachine illustrated includes four pairs of twisting belts 21`whichsimultaneously form seven links Y in the casing Said l machine may. haveonly a single pair of twisting belts 21, with a capacity forsimultaneously forming three links and each pair of belts 21 added tothe machine will, increase` its capacity by'two links. p Y

Ther twisting belts 21 are flat, relatively Wide and-are formed from awoven or other material .having a good frictionV surface. Each belt 21of each pair is mounted to run relatively large lowerpulley 2,11 andwhich pulleys fare carried byv a pair of laterally f over a relativelysmall upper pulley 23 and a the runs of vthe respective belt 21 and eachthereof includes a thimble and a nut-equipped bolt. The arms have ontheir backs at the lower ends thereof outwardly projecting extensions.27 having seats through which The lower pulleys 24 have trunnions jour-'naled in either-upper or lower seats 29 in the Ypairs ofarms 25 and theupper pulleys 23 are i loosely journaled on fixed short shafts 30 car-A. so

V'30 ythieaded engagement with the upper vend porj "riedvby screws 31,which act astighteners for the belts 21. Thesescrews 3 1 extend radially through holes inthe'ends of the shafts are swivelled therein,. havescrewtions of the arms 25- andform longitudinal extensions thereof.

rlfhe twisting belts 21 of` each pair are driven inv reverse vdirectionsand adjacent belts 21 on each vrock-shaft 19 are reversely driven. Saidbelts 21, carried by each vrockshaft 19, are alternately long and shortwith their upper pulleys 23 in axial alignment *which leaves their lowerends of different lengths with the lower pulleys 24 for'the long belts21 in axial alignment `and the lower pulleys 24 for the short belts 21in axial alignment o y f1 rIhe pulleys 24 for the short belts'21 arefdriven by an upper shaft 32 and the Vpulleys 24 for the long belt 21are driven by the lower shaft33. `These shafts 32 and 33 are 'formedseats in the'lower pulleys 24 Vat the axes thereof. "The polygonalformation of the shafts 32 and 33 andtheir seats in the lower pulleysA24 kconnect said shafts and pulleys vfor common rotationA but permit suare and extend through corres ondinfl axial sliding movement. of thepulleys 24 'i Vruns of the long belts. 21 and loosely throughv on theshafts '32 and 33.

The upper shafts 32 extend between the the upper trunnion seats 29 inthe respective arms 25 and the lower shafts 33, extend below the pulleys24 for the short belts 21 and looselythrough the lower trunnion seats 29in the freedom for longitudinal slidingmovementl thereon.

` respective arms 25.

A pair of intermeshing segmental gears 34 `f connect the rock-shafts 19for common rotary movement and open and close the arms-25 of each pairat the same speed and in predetermined relation. The rock-'shafts 19extend vthrough seats in the hubs ofthe segmental :gears 34'and holdsaid gearsfrom turning about the axes of the rock-shafts 19 but withSet-screws 35 in the hubs of the segmental gears 34 impinge against therockshafts 19 and hold the segmental Vgears 34 thereon between thebearing head 16 and adv jacent pair of arms l25. Integral lwith* thehubs of the segmental gears 34 is a pair of upstanding posts 36connected by a coiled spring under strain torock the shaftsg19 andvclose the belts 21 onto the sausagecasing X, as will presently appear. Y

The spacers 2O are arranged in pairs with one of the pairs `of belts 21therebetween and spaced equi-distant therefrom. Each spacer 20 includesa pair of cooperating jaws 38 carried on a pair of longitudinal bars 39which extend parallel to the rock-shafts 19 andl thercabove. rlhe rbars39 are rigidly secured the inner sections of the arms 4()r arebifurcated, straddle the rock-shafts 19 and are adjustablybu't rigidlysecured thereto by set- .screws v41. Said upper sectionsof the arms 40are pivotedto the inner sections of saidto the outer ends of the outersections of twol part upstanding arms 40. The-inner ends of arms, at oneside thereof, intermediirteV` of tions of the. arms 40 are yieldinglyVdrawn' inward in respect'tothe lower sections thereof by coiledVsprings 42` carried bynuttheir ends, for swinging movement /trans-iVversely of the rock-shafts 19. rlhe upper secequipped bolts 43 whichthey encircle.- These bolts 43 extend through aligned holes in lugs 44on the upper sections of the arms 40 and in vthe outer end portions ofthe lower. sections of said arms .and the springs 42l are compressedbetweensaid lower` sections and nuts j on the bolts 43, see Fig. 7 Y

One jaw 38 of each lpair comprises a smgle member and the other a pairof laterally spaced members between which said single member is arrangedto move, seeFig.A 10.- v rlhe opposing or operative faces of the jaws 38are V-shaped and ywhen closed form a continuous surfacethat lengages thecasing throughout its entire circumference. At the. bottom ofthe jaws 38the spacers 20 haveformed therewith overlapping fingers 45 forYsupporting the casing X in said spacers.

Outwardly projecting shanlrs 46formed with the spacers 2O are rigidlysecured to the bars 39 by clamps comprising plates 47 and nutequippedbolts 48, andy which clamps support the spacers 20 of each pair incooperaward or from each other Vto'vary the lopening Vbetween the jaws38 when closed. Above the jaws 38 the spacers 20,-haveupwardly andoutwardly Adiverging extensions 49 the upsmooth upper ends on saidspacers toV prevent the casing'X from being broken whenr placed therein.

The extensions' 49v when the jaws 38 are open form a hopper-like openingfor directing the casing X laterally downward bel tween the'jaws 38.-The lingers 45 support the casing X while the jaws 38 are being tiverelation with freedom for adjustment to-y Vper ends of which extenddownward to'form clamped thereon and after said' jaws 'have been openedat the completion of the forming of said casing into links Y. As thejaws 38 close on the casing X the same' is graduallysqueezed by theconverging surfaces of said jaws and the filling in said casing crowdedin opposite directions and the'casing gathered into a close mass Vso.that the same may be readily twisted. vEach member of eachspacer isformed from a sin-l gle smooth round wire that has no rough or Vsharpsurfaces tending to break the casing X.

The supports 22 are in the form offiat `fingers which extendtransversely between the bars 39, are rigidly secured at their frontends to the front bar 39 and their other or rear ends are bent laterallydownward to form stops arranged to engage the rear bar 39 at its frontlongitudinal edge and limit the closing movement of the' jaws 38. It

'is important 'to note by reference' to Figs.v 1

vto the jaws 38 to vary the distance between t-he opposing faces of thebelts 21 of each pair withoutvaifecting the adjustment of the jaws 38 inrespect to each other. The approaching or closing movement of the belts21 of each pair is limited by an adjustable f laterally forward and itsleft-hand edge affy stop in the form of a set-screw 51, on the frontleft-hand arm 25 of each twisting belt 21, and a cooperating strikinglug `52 on the opposite rear arm of said pair, see Figs. 7 8 and 9.

The shafts 32 and 33 are constantly driven during the operation of themachine, and hence, the belts 21 by their lower pulleys 24 on .saidshafts, from an electric motor, not shown, by a round belt 53 which runsover a grooved pulley 54 loose on-the outer end portion of a short shaft55 journaled in the bearing head 16. v On the outer face of the pulley54 is a spur pinion 56 which meshes with a spur gear 57journaled on theouter end of 'a short shaft 58 j ournaled in the bearing head 16.Secured to the shaft 58 at the in-` ner face of the gear 57 is a spurpinion 59 with which two diametrically opposite gears 60 mesh and thatare secured one to each of the two shafts 33. A pair of gears 61 securedone to each of the shafts 32 mesh one with each of the gears 60 to drive'said shafts from the f shafts 33, see Fig. 4.

The shafts 32 and 33 have flexible sections 'and' is held where head 16and *the adjacent'pu'lley`s124 vdriven thereby.' The purpose of theseflexiblejsec# Ations 62 and 6-3- is to permit the required os-`cillatory movement of the arms 25 Ito open and close the belts 21.y Itwill' be noted, by reference toFig. 5,' that-the sections of thef shafts32 and 33 journaled in the bearing" head I16 are round while the yother`sections I thereof are square, as previously stated.

v*The rear rock-shaft 19 is operated from the front driven shaft33,V andhence,"the front rock-shaft 19 by the segmental gears 34 which connectsaid two shafts, to positively fopen the spacers 20 and belts 21 oftheseveral pairs and control vtheir, closing movementsunder the actionofthey Spring 3 7, by the following connections, towit: A. crank-arm 64on the rear 'rock-shaft 19 has` a cam rollery 65'v yieldingly held bythe spring 37 on the periphery of a cam `66 on zthe shaft 55 having aspur gear 67 which meshes witha spurv pinion 68- onsaid shaft 33. Thecrank-arm 64 is mounted on thev respective rock-shaft 19*y forlongitudinal sliding movement Vthereon positioned by a--1set-screw 69,see Fig. 5. j f

The. cam roller Vv65 is j ournaled on' a stud70 adjustably mounted in aslot in the crankcase the operator gets his hand or any otherobstruction between the spacers 2() or twisting belts 21 further closingmovement thereof under the action of the Spring 37 will be stoppedandthe camroller 65 will simply be held out of Contact with the cam66and thus prevent bodily injury to the operator or damage orjstrain themachine. A

The left-hand end of the rear bar 39 is bent fords a gauge 71 at whichthe right-hand end` f of the casing X. is held when placingl the ,y samein the machine so that'the link Y formed .between said gauge andadjacent'spacers 2O will be of the same length as the other links Y.Briefly stated, the action lof the machine is as follows:

Thebelts 21 are constantly driven andthe the spring 37 and control theirclosing move# ments under the action of said spring.l The filled casingX to be formedfinto links Y is placed at the right'fhand end of themachine and the operator picks up one'end portion. thereof, holds thesame at two longitudinally spaced points and when .thespacers 20l andthe belts 21 are opened, places said casing 'p positivelyoperate therock-shafts 19 .to open said spacers and belts against the action of'i120 `therebetween on the supports l22 and the sup-v porting fingers45with the left-hand -.end of,v 13o at which-the casing' X is thusy heldare just outside of the'twoouter'most spacers 20and "said casing is heldat their two :points from 'turning durin f' the action, thereon b thebelts 21 to form the same into links Y.

'Durin` the closing of the s acers 2O their jaws 38 first engage the'casing Xat iongiplaces tension thereon tudinally Vspaced points, y whichdetermines the length of the linksY, and squeezes the lilling in saidcasing-X in oppositevdirections,

and gathers the casii-ig X at lthese points into small compact Y form;`The closing movement of the spacers on the casing X is limited by theengage- .ffment of the stops `with the rear bar 89, see

Fir. 7; The closin' action of the s aacers 2O c l h. in 1 bends thecasinfiv restino' on tne suo orts 22 thereover and under Y tension whichsecurely holds said casing at these points from turning Vduringtwistingfof the casing X by the belts 21 to form the links Y therein.

Substantially at the completion ofthe clos- 1 ing of the spacers 2O onthecasing the opthereof. j spacers 2O of the several pairs bythe cam 66completes the twisting of the casing X and' yiosin belts 210i theseveral airs are brourrht c j Y 2:,

into engagement with said casing at diametrically opposite points withsuiiicient pressiire'to canse their oppositely moving faces `to twistthesections of the casing X between the pairs of spacers 20. As previouslystated, the links Y on opposite sides of the' links on the supports'QfZare turned in opposite di- Y rectionsV to prevent unwinding when thelinks ,Y are renjioved `from the machine.

rhe closing movements of the belts 21 on the casing X is limited by thescrews V51-and these screwsmay be adjusted for casings of differentdiameters and to vary the pressure placed thereon to produce turningmovement The openingof the belts 2l and the Y.the formed links arethenremoved from the .j machine. 4The operator thenpicks up the casing totherighty of the formed links, places thesame in the machine with theright-hand end of the last formed link at the gauge 71 and the action ofthe machine just described is repeated to form the sections of saidcasing into links.

lf it is desirable to change the length of the links Y `from that formedby the spacers 20 `with which the Amachine is equipped, it

Vis only necessary to `.release the screws 11- and remove the spacingmechanism from the rockfshafts 19 and substitute other spacing mechanismtherefor in which the distance between its spacers is such as to formthe links Y the desired length. `W hen mounting other spacingvmechanism' on the machine the set-screws 28 rare released and the armsy25 V-longitudinally adjusted onthe rock-shafts 19 to position Athe belts21 midway between adjacent pairs of spacers 20: The formation of thespacing mechanism is suchv that the cashing maybe placedtherein oryremoved :therefrom by a laterall movement which may be done by easy andquick operations that increase the capacity of the machine .over onerinwhich a casing is fed endwise thereto. This,open or top feed ofthespacing and twisting mechanisms materially reduces the chancesofbreaking or damaging a casing.

To cleanseand sterilize the machine, it may be very easily and quicklyknocked-down by Aloosening the right-hand set screws 18to re"- leaseVthe bearingV head 17 from the side bars 14 and theY rock-shafts 19andfpermitsaid rock-shafts to be detachedvfrom the bearing head 16 byaxial movements to the right.- Byl loosening the setfscrews 41 thespacing;k

mechanism may be detached ,from the rockshafts 19 and thereafter byreleasing thesetscrews 28, 85 and 69` the rock-shafts 19 may bewithdrawn from the arins'25, segmental gears 34 and crank-arm 64.

Y The open or top feed to the spacers 20 andk belts 21 permits the'operator to use up the f 1 Y entiie length or a casing as tne same maybe Y Theconstruction and arrangementof the combined'spacers andsqnee'zers, wherein one L, 1 Y tiicieof ofeach pair moves within theother,

is highly important in that the members ofv said pairs hold each otherfor straight line movement to prevent shearing of the casingtherebetween.

Each unit of the machine is a rigid self-V contained structure thattakes allthe strains from the shafts that drive they twisting belts thekdesired tension.

Vhat I claim is: 1. 1n a sausage linking machine, a pair of rockshafts,two pairs of arms' mounted on the rockfshafts Aand spaced longitudinallythereof, cooperating spacersand squeeZers carried by thearms, a pairofcooperating twisting belts mounted on therock-shafts between said twopairs of arms, means for driv- 'ing the belts, means for operating therockshafts to open and close the spacers and squeez'ers and belts, saidarms having hinge joints that permit secondary opening and closingmovementsof thespacers and squeez- ,lield so that only yone or moreofthe pairs of ,belts 21 actthereoii.

i y and holds said belts to their work and under ers in respect totherock-shafts and belts,

ing belts mounted therebetween on the rockshafts, means for drivingr thebelts, means for operating the rock-shafts to open and close the spacersand squeezersland belts,

and a sausage casing support between said two yunits andcarried by oneof the tie-bars.

3. rlhe .structure ydefined in claim 2 in which said arms have hingejoints that permit secondary opening and closing movements ofthe spacersandsqueezers in respect to the rock-shafts and belts, said structurefurther includes yielding means under strain to close the spacers andsqueezers,

4. In a sausage linking machine, a frame having a pair of bearing heads,a pair 'of rock-shafts journaled in the bearing heads, one of thebearing heads being displaceable to permit the removal of therock-shafts from the bearing heads, cooperating spacers and squeezersremovably mounted on the rock-shafts, cooperating pairs of twistingbelts removably mounted` on the rock-shafts with freedom for independentadjustment longitudinally thereon, means for *drivingthe belts includingshafts having removable'l pulleys, and means for operatingv therockshafts to open and close theA spacers and squeezers and belts andseparable from the rock-shafts.

5. In a sausage linking machine, two pairs of spacers and squeezers anda pair of cooperating twisting belts between thev two pairs of spacersand squeezers, said pairsfof spacers and sdueezers and the pairrof beltsbeing mounted for independent opening and closingv movements, means foroperating'the belts, means for opening and closing the belts, means forclosing the spacers and squeezers, and means controlled by the means foropening the belts for opening the spacersy and squeezers. Y

6. The structure defined iny claim 5 in which the means for closing thespacers and. squeezers will vieldingly retard the closing movement ofthe spacers and sdueezers in respect to the belts and also permit thespacers and squeezers to'open in respect to the belts.

7. The structuredened in claim 5 which further includes an adjustablestopy for limiting the closing movement of the belts for casings ofdifferent diameters, and in which the closing movements of the spacersand squeezers are controlled by the final closing movement of the belts.

8. In a sausage linking machine, four pairs of spacers and squeezers, apair of twisting belts between the first and second pairs and a secondpair of spacers and squeezers between theAthird and fourth pairs ofspacers and squeezers. means for operating the belts of the two pairs inreverse directions, means foropening and closing the belts, means foropening and closing the spacers and squeezers. and a link support4between the second and third pairs of spacers and srpueezers andlocated' above the axis of the adjacent spacers and squeezers over whicha link is held buckled by said secondand third pairs of Vspacers andsqueezers to prevent the same belts between the first and second pair-sandl a second pair of spacers andsqueezers between the thirdv andlfourth pairs of spacers and sq'ueezers, means `for operating the beltsof the two pairs in reverse directions, means Vfor opening and closingthe belts, means for l opening andv closing the spacers and fsqueezyers, a combinedstop and link support between the second and third pairsof spacers and squeezers and operativejto limit thev closin movementcfthek spacers land, squee'zers an ,i

hold the respectivey link from turning;

` 10. In la sausage'linking machinep'alpair of bars mounted for movementtoward and from each` other, four pairs'v fof .spacers` and'squeezersmounted onthe barsfapairjof rock-shafts, a fpair 'of* beltcarriersjonv the rock-shafts between the first and second pairV ofspacers and squeezersand betweenjthe third "and fourth pairjof spacersvand ysqueezers, a pair of cooperating twistingbelts Vmounted on eachpair of belt carriers, yieldf ing means operative-on the rock-shafts toholdthe; belts closed,"andl means for operating j the rock-shafts -toopen the belts andthe jspac'ers"andsqueezers'.`

'11; lThe structure defined in claim in 'l Awhich the mounting of thebars includepiv- 4oted Varms which support the bars forv swing-`ingmoveinent toward' and from each other, `saidstructure furtherincluding yielding means under strain to draw thel bars towardeachother.l `v

` 12.y The structure-defined"inclaim :lOiinV which the .belt carriersare adjustable on the rock-shafts forlinks of differentlengthls. .Y

13. In a sausage linking machingagframe j having a pair of bearingheads,apair yof yrock-shafts journaled inthe bearing heads,

one of said 'bearing heads being displaceable to permitthe removal ofthel rock-shafts from the bearing heads,` cooperating spacers and:squeezers removablyfvmounted on the frame, cooperating pairs oftwisting belts removably mounted on the rock-shafts, means for drivingthe belts including'shaftshaving removable pulleysfand means foroperating the rock-shafts yto open vthe belts and spacers andsqueezers.- .f i j 14. The structure defined in claim 13 in whichthetwisting belts are adjustableon the rock-shafts for links of differentlengths.

l 15.@In a sausage linking machine, a pair of removable bars Vmountedformovement toward and from each other,-four pairs of spacers andsqueezers-spaced longitudinally on thebarsytwo pairs of lbelt carriers.the

belt carriers of each pair being mounted `for .movement toward andl fromleach othenwajl Y pairof twisting-'belts mounted on'each pairV of beltcarriers, one pair of beltcarriers being mounted between the iii-stV andsecond pair of spacers and squeezers, the other` pair s of saidbelt/carriers being mounted between the Vthird and fourth pair ofspacers andV squeezers, means for driving the' twisting belts in reversedirections, and means :tory

holding a link between the'second and third pair of spacers andsqueezers while links between the first and second pair of spacers andsqueezers and between the third and fourth pair of spacers. and.squeezers 'i are being turnedin reverse directions by the two pairs ofbelts, one pair ofsaidbelt carriers being Vspacers and sc'lueezfersbeing inofu'i'itedv for slight independent opening movement with respectto the belts,l.and lspring Ineans'hold-v ingvthespa'cers and squeezersin normal position with respect to the belts.

In testimonywhereof I afliX my signature.

PARKER A. JACOBSON. Y Y

adjustable toward or from the 'otherpair of Q VAbelt carriers tocompensatefor the spacers and squeezers whenpositioned 4to `forni linksof different lengths.

16. In a sausage linking machine, V'tour pairs lof spacers and squeezersspaced onel in advance of theother, two pairs of belt ycar-y riers, the'belt carriersof each pairbeing Vmounted for movementV toward and l'fromeach other, a pair oftwistinglbelts mounted on each pair of beltcarriers, one pair of belt carriers being mounted between the :firstandV f l second pair of spacers and squeezers and the otherpair of saidcarriers being mounted i-between the third and fourthpair of spacers andsqueezers, meansr for driving theftwisting KYbelts inV reversedirections, and Y"means for holding a link between the ysecond and thirdf I Y pair of spacers and squeezers while links bev tween the iirst andsecond pair of spacers and squeezers and between the third and fourth,pair of spacers and squeezers `aire beinlg y turned in reversedirections by the` two'pa'irs of belts,v one pair of said beltcarriersbeing adjustable toward or from the other pair of ley on eachY arm,'abelt arranged to run over the upper and lower pulleys rofl: each arm,the Vlower pulleys being staggered in respect to the plane of the beltand in two series, the

f 'Milo i pulleys ot' each series being axially aligned, l

a 'driving shaft for each series of lower pulleys, the two drivingshafts bein gpdrivengin reverse directions, the belts on `the tworockshafts being arranged in cooperating pairs, and means `for operatingthe rock-shafts to reciprocate the'arms andopen and close the belts ofAsaid pairs. Y z L 18. V In a sausage 'linking machine two pairs l,ofspacers and squeezersl andf apair of cooperating twisting ,beltstherebetween, means for operating the belts, yielding ineans for.closing the vbelts and the",r spacers Aand Vsqueezers, positive meanskfor opening the belts vand the spacers and the squ-eezers, said

